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Dimensions: Height .625 inch – Head Width .625 inch – Shaft .265 inch – Length 4 inch – Use with T30 Torx Bit Bronzed Coated Exterior – Prevents Rust and Corrosion – ACQ Lumber Compatible Type 17 Notched Extra Sharp Point for Quick Starts without “Walking” Reduces Need for Pre-Drilling Knurled Screw Shoulder Lowers Drill Torque Requirements High Quality Threads Cut Clean and Easy Great Screw for Decking Fencing Roofing Framing Timber Frame or Post and Beam Construction Lag Screws Far Exceed Standard Lag Bolts in Shear Compression Forces#15 x 4 inch Inch CTX Construction Lag Star Drive Screws Dimensions: Height .625 inch – Head Width .625 inch – Shaft .265 inch – Length 4 inch – Use with T30 Torx Bit Bronzed Coated Exterior – Prevents Rust and Corrosion – ACQ Lumber Compatible Type 17 Notched Extra Sharp Point for Quick Starts without “Walking” Reduces Need for Pre-Drilling Knurled Screw Shoulder Lowers Drill Torque Requirements High Quality Threads Cut Clean and Easy Great Screw for Decking Fencing Roofing Framing Timber Frame or Post and Beam High Performance Exterior Coated Torx/Star Drive Wood Construction Lag Screws “CTX#15 Diameter by 4 inch Long. 5/16 inch Construction Lag Screw Thread Diameter With a Modified Truss 5/8 inch Head Diameter for Better Compression Forces. Use T30 Torx/Star Drive Bit for Installing Construction Lag Wood Screws. Our Bronze Star Torx/Star Drive Screws are an Excellent Fastener for Many Applications in Hard and Soft Woods Chipboard and Tough Materials. Our Exterior Coated Construction Lag Wood Screws are an Rugged Multipurpose Fastener for Professional Operations and Demanding Industries. Our Construction Lag Screws are Strong – Can be Removed and Reused. Torx/Star Drive Wood Screw Head Provides Twice the Torque of Phillips or Square Drive Screw Heads. This Listing is for 100 Count Exterior Coated Construction Lag Screws. Screw Engineering Specs: Average Shear Strength of #15 Shank — 3057 lbs Average Pull-Out Strength —————– 1494 lbs Screw Pull-Out is Calculated with a 3 inch Length Screw in the wood species: Yellow Pine Wood